We have found that alumina from aluminium nitrate is better than that from aluminium chloride for DME production, did you try this before ?

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Ahmed I. Osman

The answer because they produced different aluminium phases

Pavel Pazdera

Ahmed is right (different structures), they can also help article plus references:

http://www.iiuedu.eu/press/journals/sds/SDS_2010/DET_Article2.pdf

yes for alumina nitrate it produce eta alumina and the chloride gives the gamma alumina